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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 34 (1950)

Issue: 10. (October)

First Page: 2027

Last Page: 2060

Title: New Method of Correlation by Resistivity Values of Previous HitElectricalNext Hit Logs

Author(s): A. P. Claudet (2)


The silhouette of the curves of Previous HitelectricalNext Hit logs is conventionally used for subsurface correlation. The new method hereafter described consists in making use of the numerical values of the shale resistivities for the elucidation of structural problems. Cross sections showing the subsurface correlation derived from Previous HitelectricalTop logs recorded on wells spaced over large distances throughout Louisiana, Mississippi, and Alabama are shown, illustrating the progressive variations of shale resistivities which occur with changes in locations or geological age. These clay or shale resistivity values may be correlated over considerable distances under favorable conditions, but they are particularly useful in short-range correlations under faulted field conditions.

Two logs are further presented which show cyclical variations in shale resistivity values. These variations are perhaps related to the variation in the lithologic characters of the shales, and to the salinity of their interstitial waters during the geological transgressions and regressions of the seas in which they were deposited.

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